WooCommerce Upsells Shortcode: outputs product upsells when the [woocommerce_product_upsells] shortcode is used

woocommerce-upsells-shortcode.php

<?php
/**
 * Plugin Name: WooCommerce Upsells Shortcode
 * Plugin URI: http://skyver.ge/51
 * Description: Adds a shortcode to output WooCommerce product upsells; removes them from the original location when used
 * Author: SkyVerge
 * Author URI: https://www.skyverge.com/
 * Version: 1.0.0
 *
 * Copyright: (c) 2016 SkyVerge, Inc. ([email protected])
 *
 * License: GNU General Public License v3.0
 * License URI: http://www.gnu.org/licenses/gpl-3.0.html
 *
 * @author    SkyVerge
 * @copyright Copyright (c) 2016, SkyVerge, Inc.
 * @license   http://www.gnu.org/licenses/gpl-3.0.html GNU General Public License v3.0
 *
 */


if ( ! defined( 'ABSPATH' ) ) exit; // Exit if accessed directly


/** 
 * Adds a [woocommerce_product_upsells] shortcode, which outputs the upsells for a product
 * This shortcode will only render on product pages.
 *
 * If upsells are output by the shortcode, they will be removed from the default position below the description.
 *
 * The optional "columns" argument can be added to the shortcode to adjust the upsells output and styles
 */
class WC_Upsells_Shortcode {
	
	
	const VERSION = '1.0.0';
	

	// @var WC_Upsells_Shortcode single instance of this plugin
	protected static $instance;
	

	// set the column count so we can get it if overridden by the shortcode
	protected $column_count = NULL;


	public function __construct() {
		
		// add the [woocommerce_product_upsells] shortcode
		add_shortcode( 'woocommerce_product_upsells', array( $this, 'render_product_upsells' ) );
		
		// adjust the upsell display when shortcode is used
		add_filter( 'woocommerce_up_sells_columns', array( $this, 'adjust_upsell_columns' ) );
		add_action( 'wp_print_footer_scripts', array( $this, 'adjust_column_widths' ) );
	}


	/** Helper methods ***************************************/


	/**
	 * Main WC_Upsells_Shortcode Instance, ensures only one instance is/can be loaded
	 *
	 * @since 1.0.0
	 * @see wc_upsells_shortcode()
	 * @return WC_Upsells_Shortcode
	*/
	public static function instance() {
		if ( is_null( self::$instance ) ) {
			self::$instance = new self();
		}
		return self::$instance;
	}


	/** Plugin methods ***************************************/


	/**
	 * Set up a shortcode to output the WooCommerce product upsells
	 *
	 * @since 1.0.0
	 * @param array $atts shortcode attributes
	 */
	public function render_product_upsells( $atts ) {

		// bail if we're not on a product page
		if ( ! is_singular( 'product' ) ) {
			return;
		}

		$a = shortcode_atts( array(
			'columns'	=> '3',
		), $atts );
		
		// only use the shortcode attribute if it's an integer, otherwise fallback to 3
		$columns = (int) $a['columns'] ? $a['columns'] : 3;
	
		$this->remove_default_upsells();
		$this->column_count = $columns;
	
		// buffer our upsell display and output it with a custom CSS class
		ob_start();	

		?><div class="wc_upsell_shortcode"><?php	
			woocommerce_upsell_display();
		?></div><?php
	
		// output the buffered contents
		return ob_get_clean();
	}


	/**
	 * Adjust the number of columns to whatever the shortcode has set
	 *
	 * @since 1.0.0
	 */
	public function adjust_upsell_columns( $columns ) {
	
		// bail if the column count is not set, it means our shortcode isn't in use
		if ( ! isset( $this->column_count ) ) {
			return $columns;
		}
		
		// otherwise, set the column count to our shortcode's value
		return $this->column_count;
	}


	/**
	 * Adjust the column width CSS based on the number of columns
	 *
	 * @since 1.0.0
	 */
	public function adjust_column_widths () {
	
		// bail if the column count is not set, it means our shortcode isn't in use
		if ( ! isset( $this->column_count ) ) {
			return;
		}
	
		// set the related product width based on the number of columns + some padding
		$width = ( 100 / $this->column_count ) * 0.90;
	
		echo '<style>
		.woocommerce .wc_upsell_shortcode ul.products li.product,
		.woocommerce-page .wc_upsell_shortcode ul.products li.product {
			width: ' . $width . '%;
			margin-top: 1em;
		}</style>';
	
	}		

	
	/**
	 * Remove the upsells on the product page if shortcode is used
	 *
	 * @since 1.0.0
	 */
	private function remove_default_upsells() {
		remove_action( 'woocommerce_after_single_product_summary', 'woocommerce_upsell_display', 15 );
	}

} // end \WC_Upsells_Shortcode class


/**
 * Returns the One True Instance of WC_Upsells_Shortcode
 *
 * @since 1.0.0
 * @return WC_Upsells_Shortcode
 */
function wc_upsells_shortcode() {
	return WC_Upsells_Shortcode::instance();
}


// fire it up!
wc_upsells_shortcode();

Hey, I found your code but it is now working for me, I just getting empty result, nothing is showing
I wrote
AAA [woocommerce_product_upsells] BBB
and the result is
AAA (empty) BBB